Answer:
Average amount of carbon per km² = 24.238 kilo tonnes per km²
Step-by-step explanation:
We know that the average amount of carbon in 22.6 million km² is 547.8 gigatonnes. To know the average amount of carbon in 1 km², all we have to do is cross multiplication as follows:
1 km² .....................................> ?? carbon
22.6 million km² .....................> 547.8 gigatonnes of carbon
Average amount of carbon per km² = (547.8 * 10^9 *1) / (22.6 * 10^6)
Average amount of carbon per km² = 24.238 kilo tonnes per km²
Hope this helps :)